U.S. patent number 5,501,076 [Application Number 08/334,740] was granted by the patent office on 1996-03-26 for compact thermoelectric refrigerator and module.
This patent grant is currently assigned to Marlow Industries, Inc.. Invention is credited to Michael J. Doke, Richard A. Howarth, Leonard J. Recine, Sr., Charles A. Sharp, III.
United States Patent |
5,501,076 |
Sharp, III , et al. |
March 26, 1996 |
**Please see images for:
( Certificate of Correction ) ** |
Compact thermoelectric refrigerator and module
Abstract
A module for controlling the temperature within an enclosed
structure is provided. The module comprises a thermoelectric
assembly, a platform, and a panel. The thermoelectric assembly
comprises a thermoelectric device with a first heat sink disposed
on one side of the device and a second heat sink disposed on the
other side of the device. The thermoelectric assembly further
comprises an electric motor attached to one of the heat sinks with
a rotating shaft extending longitudinally through the electrical
motor and both heat sinks. A propeller may be attached to each end
of the rotating shaft adjacent to the first heat sink and the
second heat sink respectively. The platform may be removably
engaged with the enclosed structure. A first fastener may be used
to attach the thermoelectric assembly to the platform. A first
opening may be provided in the platform adjacent to one of the
propellers. The panel preferably attaches to the platform for use
in mounting and sealing the thermoelectric module within the
enclosed structure.
Inventors: |
Sharp, III; Charles A. (Dallas,
TX), Doke; Michael J. (Dallas, TX), Howarth; Richard
A. (Allen, TX), Recine, Sr.; Leonard J. (Plano, TX) |
Assignee: |
Marlow Industries, Inc.
(Dallas, TX)
|
Family
ID: |
26725329 |
Appl.
No.: |
08/334,740 |
Filed: |
November 23, 1994 |
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
146712 |
Nov 1, 1993 |
5367879 |
|
|
|
47695 |
Apr 14, 1993 |
5315830 |
|
|
|
Current U.S.
Class: |
62/3.6; 62/3.2;
62/429; 62/440 |
Current CPC
Class: |
F25B
21/02 (20130101); H01L 35/30 (20130101); F25B
2321/0251 (20130101); F25D 11/00 (20130101); F25D
17/06 (20130101); F25D 2317/0655 (20130101); F25D
2317/0665 (20130101); F25D 2317/0681 (20130101) |
Current International
Class: |
F25B
21/02 (20060101); H01L 35/30 (20060101); H01L
35/28 (20060101); F25D 11/00 (20060101); F25B
021/02 () |
Field of
Search: |
;62/3.2,3.3,3.6,3.62,3.7,457.1,457.2,457.9,440,404,419,428,429 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
0627705 |
|
Mar 1992 |
|
AU |
|
0342165 |
|
Nov 1989 |
|
EP |
|
1125957 |
|
Mar 1962 |
|
DE |
|
1198837 |
|
Aug 1965 |
|
DE |
|
320580A |
|
Jan 1991 |
|
JP |
|
8101739 |
|
Jun 1981 |
|
WO |
|
8504948 |
|
Nov 1985 |
|
WO |
|
Other References
"A New Scientific Development in Refrigeration" Electric & Gas
Technology, Inc..
|
Primary Examiner: Sollecito; John M.
Attorney, Agent or Firm: Baker & Botts
Parent Case Text
RELATED APPLICATION
This is a continuation-in-part of pending patent application Ser.
No. 08/146,712 filed Nov. 1, 1993, entitled Modular Thermoelectric
Cooler, now U.S. Pat. No. 5,367,879, which is a
continuation-in-part of patent application Ser. No. 08/047,695
filed Apr. 14, 1993, entitled Modular Thermoelectric Assembly of
same assignee now U.S. Pat. No. 5,315,830.
Claims
What is claimed is:
1. A module for controlling the temperature within an enclosed
structure comprising:
a thermoelectric assembly having
a thermoelectric device with a first heat sink disposed on one side
of the device and a second heat sink disposed on the other side of
the device,
an electrical motor attached to one of the heat sinks with a
rotating shaft extending longitudinally through the electrical
motor and both heat sinks,
a first propeller attached to a first end of the rotating shaft
adjacent to the first heat sink;
a platform operable to removably engage with the structure, the
platform having a first fastener and a first opening, the first
fastener operable to mount the thermoelectric assembly to the
platform, the first opening disposed adjacent to one of the
propellers; and
a panel attached to the platform.
2. The module of claim 1, further comprising:
a resilient gasket coupled to one of the heat sinks and operable to
sealingly engage with the structure;
a second propeller attached to a second end of the rotating shaft
adjacent to the second heat sink;
wherein the platform slidably engages with the structure; and
wherein the panel has a second opening, the second opening operable
to ventilate one of the heat sinks.
3. The module of claim 1, wherein the panel comprises a second
opening, the second opening operable to ventilate one of the heat
sinks.
4. The module of claim 1 wherein the platform slidably engages with
the structure.
5. The module of claim 1, the platform comprises a second fastener
to receive a power supply.
6. The module of claim 1, further comprising insulation material
attached to the platform for insulating the structure.
7. The module of claim 1, further comprising a second propeller
attached to a second end of the rotating shaft adjacent to the
second heat sink.
8. A thermoelectric refrigerator comprising:
a box having a module opening and at least one module receiving
member; and
a module, the module including
(1) a thermoelectric assembly having
a thermoelectric device with a first heat sink disposed on one side
of the device and a second heat sink disposed on the other side of
the device,
an electrical motor attached to one of the heat sinks with a
rotating shaft extending longitudinally through the electrical
motor and both heat sinks, and
a propeller attached to each end of the rotating shaft adjacent to
the first heat sink and the second heat sink respectively;
(2) a platform operable to removably engage the module receiving
member, the platform having a first fastener and a first opening,
the first fastener operable to fasten the thermoelectric assembly
to the platform, the first opening disposed adjacent to one of the
propellers; and
(3) a panel attached to the platform.
9. The thermoelectric refrigerator of claim 8 wherein the platform
slidably engages with the module receiving member.
10. The thermoelectric refrigerator of claim 8 wherein the
insulated box further comprises a top and a plurality of sides
substantially perpendicular to the top and at least one intake
opening in one of the sides for supplying air to one of the
propellers.
11. The thermoelectric refrigerator of claim 8 wherein said box
further comprises a compartment adjacent to said module opening;
and
wherein said thermoelectric refrigerator further comprises a door
to control access to said compartment.
12. The thermoelectric refrigerator of claim 8 wherein one of the
propellers is operable to circulate air within the insulated
box.
13. The thermoelectric refrigerator of claim 8 wherein the module
further comprises a resilient gasket coupled to one of the heat
sinks and operable to sealingly engage with the insulated box.
14. The thermoelectric refrigerator of claim 8 wherein the panel
has a second opening, the second opening operable to ventilate one
of the heat sinks.
15. The thermoelectric refrigerator of claim 10 wherein one of the
propellers is operable to circulate air in an air flow path within
the interior of the insulated box and over the surface of one the
heat sinks.
16. The thermoelectric refrigerator of claim 14 wherein the
platform slidably engages with the module receiving member.
17. A method of making a module for controlling the temperature
within an enclosed structure comprising:
forming a thermoelectric assembly having a thermoelectric device
with a first heat sink disposed on one side of the device and a
second heat sink disposed on the other side of the device, an
electrical motor attached to one of the heat sinks with a rotating
shaft extending longitudinally through the electrical motor and
both heat sinks, a propeller attached to each end of the rotating
shaft adjacent to the first heat sink and the second heat sink
respectively;
fastening the thermoelectric assembly to a platform having a first
opening therein, the first opening adjacent to one of the
propellers of the fastened thermoelectric assembly;
attaching a panel to the platform; and
attaching the panel and the platform to the structure through a
second opening in the structure, the second opening for receiving
the thermoelectric assembly.
18. The method of claim 17 further comprising the steps of:
providing the thermoelectric assembly with a resilient gasket
coupled to one of the heat sinks; and
sealingly engaging the resilient gasket with the structure.
19. The method of claim 17 wherein the attaching step further
comprises removably attaching the panel and the platform by
slidingly engaging the platform with the structure.
20. The method of claim 17 further comprising the step of slidingly
engaging the platform with the structure.
21. The method of claim 17 further comprising the step of providing
a first air flow path to circulate air over the surface of the
first heat sink.
22. The method of claim 17 further comprising the step of providing
a second air flow path to circulate air over the surface of the
second heat sink and within a compartment of the enclosed
structure.
Description
TECHNICAL FIELD OF THE INVENTION
This invention relates to thermoelectric devices and more
particularly to the use of a thermoelectric module to maintain the
temperature of a container, box, or any other type of enclosed
structure within a desired temperature range.
BACKGROUND OF THE INVENTION
The basic theory and operation of thermoelectric devices has been
developed for many years. Modern thermoelectric devices typically
include an array of thermocouples which operate by using the
Peltier effect. Thermoelectric devices are essentially small heat
pumps which follow the laws of thermodynamics in the same manner as
mechanical heat pumps, refrigerators, or any other apparatus used
to transfer heat energy. The principal difference is that
thermoelectric devices function with solid state electrical
components (thermocouples) as compared to more traditional
mechanical/fluid heating and cooling components.
When DC electrical power is applied to a thermoelectric device
having an array of thermocouples, heat is absorbed on the cold side
of the thermocouples and passes through the thermocouples and is
dissipated on the hot side of the thermocouples. A heat sink
(sometimes referred to as the "hot sink") is preferably attached to
the hot side of the thermoelectric device to aid in dissipating
heat from the thermocouples to the adjacent environment. In a
similar manner a heat sink (sometimes referred to as a "cold sink")
is often attached to the cold side of the thermoelectric device to
aid in removing heat from the adjacent environment. Thermoelectric
devices are sometimes referred to as thermoelectric coolers.
However, since they are a type of heat pump, thermoelectric devices
can function as either a cooler or a heater.
There are a wide variety of containers and enclosed structures
which are designed to be maintained within a selected temperature
range. Examples of such containers and enclosed structures include,
but are not limited to, "ice chests", picnic coolers, cabinets
containing sensitive electronic equipment, and organ transplant
containers. The use of thermoelectric devices which operate on a
12-volt DC system are well known to maintain desired operating
temperatures in portable refrigerators or cooler associated with
various types of motor vehicles. An example of a container having a
thermoelectric cooler is shown in U.S. Pat. No. 4,726,193 entitled
"Temperature Controlled Picnic Box". This patent is incorporated by
reference for all purposes within this application.
Previously developed enclosed structures include thermoelectric
refrigerators. Due to difficulties in achieving a sufficient seal
between the enclosed structure and apparatus contained therein for
thermoelectric cooling, previously developed thermoelectric
refrigerators often are difficult to assemble and test. Often the
location of the thermoelectric apparatus within the refrigerator
prevented the use of efficient manufacturing and assembly
techniques. In addition, if the thermoelectric apparatus
malfunctions, it may be expensive and time consuming to repair or
replace.
SUMMARY OF THE INVENTION
In accordance with the present invention, disadvantages and
problems associated with previous thermoelectric assemblies used to
maintain selected temperatures in an enclosed structure or
container have been substantially reduced or eliminated.
One aspect of the present invention includes a thermoelectric
module for controlling the temperature within an enclosed
structure. The module comprises a thermoelectric assembly,
platform, and panel. The thermoelectric assembly comprises a
thermoelectric device having a first heat sink secured to one side
of the thermoelectric device and a second heat sink secured to the
other side of the thermoelectric device. An electrical motor may be
secured to either heat sink with a rotating shaft extending
longitudinally through the electrical motor and both heat sinks.
Propellers are provided on each end of the rotating shaft adjacent
to the heat sinks. The platform may be removably engaged with the
enclosed structure. A first fastener may be used to attach the
thermoelectric assembly to the platform. A first opening may be
provided in the platform adjacent to one of the propellers. The
panel is preferably attached to the platform for use in mounting
and sealing the thermoelectric module with the enclosed
structure.
Important technical advantages of the present invention include
that the thermoelectric module is easy to assemble. Similarly, the
module may easily be connected to an enclosed structure. The module
may also easily be removed for repair or replacement should it
malfunction. The enclosed structure in which the module is placed,
such as, for example, a thermoelectric refrigerator, is easy to
assemble because of the modular design of the present invention.
The module also may be assembled and tested prior to insertion into
the enclosed structure. In this way, a manufacturer need not
assemble an entire refrigerator before testing the thermoelectric
assembly for defects. The enclosed structure can also be assembled
in a different location than the thermoelectric module, given the
ease of testing the module. The present invention may thus reduce
labor costs and/or scrap costs that may be incurred in assembling
more complicated enclosed structures and/or thermoelectric
assemblies.
Another advantage of the thermoelectric module is that it can be
used for both heating and cooling an enclosed structure. Although
the illustrated embodiment may be advantageously used in a
thermoelectric refrigerator, it could also be used in a
thermoelectric heater or oven.
Other technical advantages of the disclosed invention will be
apparent to those skilled in the art.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the present invention, and the
advantages thereof, reference is now made to the following written
description taken in conjunction with the accompanying drawings, in
which:
FIG. 1 is an isometric drawing of a container or enclosed structure
having an embodiment of a thermoelectric assembly incorporating the
present invention;
FIG. 2 is an enlarged isometric drawing, in section and in
elevation with portions broken away, of the thermoelectric assembly
and container of FIG. 1;
FIG. 3 is a schematic drawing in section and in elevation with
portions broken away, showing the thermoelectric assembly of FIG. 2
with the preferred air flow paths;
FIG. 4 is a drawing in elevation and in section showing a
thermoelectric assembly incorporating the present invention;
FIG. 5 illustrates an exploded perspective view of a second
embodiment of a module for controlling the temperature within an
enclosed structure constructed in accordance with the teachings of
the present invention and a thermoelectric refrigerator constructed
in accordance with the teachings of the present invention;
FIG. 6 illustrates a bottom view of the module of FIG. 5;
FIG. 7 illustrates a cross-sectional end view of the module of FIG.
5 inserted into the thermoelectric refrigerator of FIG. 5; and
FIG. 8 illustrates a cutaway side view of the thermoelectric
refrigerator of FIG. 5 with the module of FIG. 5 inserted.
DETAILED DESCRIPTION OF THE INVENTION
The preferred embodiments of the present invention and its
advantages are best understood by referring to FIGS. 1 through 8 of
the drawings, like numerals being used for like and corresponding
parts of the various drawings.
As shown in FIG. 1, container or enclosed structure 20 includes
modular thermoelectric assembly 30 disposed within end 22 of
container 20. Container 20 could be any type of enclosed structure
such as an ice chest, picnic cooler, cabinet for electronic
equipment, pharmaceutical storage, organ transplant container, etc.
Container 20 may be a permanently mounted enclosure in a building
or in a motor vehicle such as an automobile or airplane, or a hand
carried portable container. An important feature of the present
invention is the ability to modify thermoelectric assembly 30 for
use with any type of enclosed structure or container.
Thermoelectric assembly 30 includes thermoelectric device 32 with
first heat sink 40 and second heat sink 50 disposed on opposite
sides thereof. Thermoelectric device 32 preferably includes a
plurality of thermocouples or thermoelectric elements 34 disposed
between thermally conductive plates 36 and 38. For some
applications, plates 36 and 38 may be formed from ceramic and/or
composite materials as desired. Thermoelectric elements 34 may be
selected from materials such as bismuth telluride to provide an
array of P-N junctions with the desired thermoelectric
characteristics to allow thermoelectric device 32 to function as a
heat pump.
Thermoelectric elements 34 are preferably connected electrically in
series and thermally in parallel by plates 36 and 38. Conductor or
electrical power cord 24 is provided to supply electrical energy
from a 12 volt DC power supply (not shown). The power supply can be
a battery, DC power generator, AC/DC converter, or any other
appropriate source of DC electrical power. When DC electrical power
is supplied to thermoelectric device 32, heat is absorbed on the
cold side represented by plate 38 and passes through thermoelectric
elements or thermocouples 34 and is dissipated on the hot side at
plate 36.
The efficiency of thermoelectric device 32 is substantially
improved by attaching first heat sink 40 to hot plate 36 and second
heat sink 50 to cold plate 38. Since heat sink 40 is attached to
hot plate 36, it is sometimes referred to as the hot sink. In the
same manner, since heat sink 50 is attached to cold plate 38, it is
sometimes referred to as the cold sink. Appropriate bonding
techniques such as soldering (not shown) may be used to assemble
ceramic plates 36 and 38 with thermoelectric elements 34 disposed
therebetween. Appropriately sized bolts and screws (not shown) may
be used to assemble heat sinks 40 and 50 with thermoelectric device
32 disposed therebetween.
Heat sinks 40 and 50 are shown as fin type heat exchangers extruded
as a single unit from appropriate material such as aluminum or
copper. Heat sinks 40 and 50 could be manufactured from other types
of material having the desired thermal conductivity and strength
characteristics. In addition, other heat exchangers designs such as
pin fin, slotted fin heat or fin welded heat sinks could be used in
place of the single unit extruded heat sinks shown in FIGS. 2, 3
and 4.
Layer 42 of appropriate insulating material such as neoprene foam,
polystyrene, polyurethane or cork is disposed between heat sinks 40
and 50. For many applications, neoprene foam is the preferred
material for insulating layer 42. Heat sink 40 and insulating layer
42 cooperate to provide means for installing modular thermoelectric
assembly 30 within an appropriately sized opening into enclosed
structure 20. Since heat sink 40 is generally designed to have a
larger surface area than cold sink 50, portion 44 of insulating
material 42 extends beyond the periphery of heat sink 50 to form a
flange suitable for engagement with opening 26 in container 20.
Heat sink 40 insulating layer 42 and heat sink 50 are shown in
FIGS. 1 through 4 as having a generally rectangular cross-section.
Opening 26 which extends through end 22 of container 20 includes a
similar rectangular configuration for engagement with portion 44 on
the periphery of insulating material 42. An important feature of
the present invention is that heat sink 40, insulating layer 42 and
heat sink 50 may be modified to have any geometric configuration
such as circular, oval or triangular as appropriate for the
specific container or enclosed structure in which modular
thermoelectric assembly 30 will be installed.
The present invention allows optimizing the geometric configuration
of the thermoelectric assembly to reduce costs of installation
within a selected container or enclosed structure while at the same
time enhancing the cooling/heating efficiency of thermoelectric
device 32. The present invention allows maximizing the efficiency
of the hot sink and/or the cold sink depending upon the application
in which the thermoelectric assembly will be used. For some
applications, hot sink 40 may be positioned within the enclosed
structure and cold sink 50 on the exterior. For other applications,
the polarity of the electrical power supplied to thermoelectric
device 32 may be reversed to reverse the function of hot sink 40
and cold sink 50. Therefore, a thermoelectric assembly
incorporating the present invention may be installed into an
enclosed structure or container without having access to the
interior of the enclosed structure or container to either cool or
heat the interior.
Heat sink 40 and insulating layer 42 cooperate to function as
structural support for thermoelectric assembly 30 within opening
26. Insulating layer 42 also functions as a gasket to form a fluid
barrier between heat sink 40 and opening 26. Insulating layer 42
also provides a vapor barrier to block opening 26 and prevent
undesired air flow therethrough.
Electrical motor 60 is preferably secured to first heat sink 40.
Electrical conductor 24 is used to supply power to electrical motor
60. Rotating shaft 62 preferably extends through electrical motor
60, heat sink 40, insulating layer 42 and heat sink 50. Seals (not
shown) may be provided between the exterior of rotating shaft 62
and the adjacent portions of insulating layer 42 to prevent
undesired air flow along shaft 62. Propeller 64 is attached to the
end of rotating shaft 62 extending from heat sink 40. Propeller 66
is attached to the other end of shaft 62 extending from heat sink
50. By positioning propeller 64 adjacent to its associated heat
sink 40 and propeller 66 adjacent to its associated heat sink 50,
the circulation of air over the respective heat sinks is
substantially increased which results in improved efficiency of
heat sinks 40, 50 and thermoelectric device 32.
In the embodiment illustrated in FIGS. 1-4, electrical motor 60 may
be secured to first heat sink 40 by forming a recess in heat sink
40. For example, the fins of heat sink 40 may be milled to form a
recess for the motor. As an alternative, a different type of
electrical motor 60 could be used that may avoid the need to form a
large recess for the motor. Electrical motor 60 could have the
propeller surrounding the motor housing itself. This type of motor
is commonly used in the design of a muffin fan. With the
alternative choice for electrical motor 60, a smaller recess could
be used that may only accomodate rotating shaft 62. Accordingly,
because a smaller recess in heat sink 40 may reduce manufacturing
costs, the alternative choice for electrical motor 60 may reduce
the overall cost of thermoelectric assembly 30. A smaller recess
that need only be large enough to accomodate rotating shaft 62
would also increase the available surface area of heat sink 40,
increasing its cooling capacity, or a smaller heat sink 40 could
possibly be used.
Modular thermoelectric assembly 30 preferably includes cover 80
attached to heat sink 40 and cover 90 disposed over heat sink 50. A
plurality of holes 82 are provided in the center of cover 80 and a
plurality of holes 92 are provided in the center of cover 90. Holes
82 and holes 92 can also be, for example, slots. A plurality of
longitudinal slots 84 are provided at each end of cover 80 on
opposite sides of holes 82. In the same manner, a plurality of
longitudinal slots 94 are provided at each end of cover 90 on
opposite sides of holes 92. The rotation of shaft 62 and the
orientation of the blades carried by propellers 64 and 66 are
selected such that when shaft 62 is rotated by electrical motor 60,
air will be drawn inwardly through holes 82 in cover 80 and holes
92 in cover 90. The air is exhausted from slots 84 at each end of
cover 80 and slots 94 at each end of cover 90. Slots 84 are
preferably aligned with fins 46 of heat exchanger 40. Thus,
electrical motor 60 rotating shaft 62, propellers 64 and 66
cooperate with covers 80 and 90 to provide the optimum air
circulation flow path with respect to fins 46 of heat sink 40 and
fins 56 of heat sink 50. The preferred air circulation flow path is
shown in FIG. 3 of the drawings. A portion of the air flow path is
generally normal to the heat transfer surfaces associated with heat
sinks 40 and 50 and hot side 36 and cold side 38 respectively.
Another portion of the air flow path is parallel with fins 46 and
56 of heat sinks 40 and 50 respectively. Insulating layer 42
cooperates with heat sink 40 and opening 26 to prevent undesired
mixing of the air circulated by propellers 64 and 66
respectively.
A thermoelectric assembly incorporating the present invention can
function satisfactorily without covers 80 and/or 90. The use of
covers 80 and/or 90 enhances the efficiency of the assembly.
Modular thermoelectric assembly 130 is shown in FIG. 4 without
covers 80 and 90.
As shown in FIGS. 2, 3 and 4, electrical motor 60 and rotating
shaft 62 are preferably disposed adjacent to thermoelectric device
32. This location for electrical motor 60 and rotating shaft 62
allows propellers 64 and 66 to force air to directly contact heat
the transfer surfaces associated with hot side 36 and cold side 38
of thermoelectric device 32. This direct impingement of air,
particularly from propeller 64 onto the heat transfer surfaces
associated with hot plate 36, has substantially increased the
efficiency of thermoelectric device 32.
For some applications, it may not be required to install both
propellers 64 and 66. Depending upon the amount of heat which will
be transferred by the specific modular thermoelectric assembly,
either propeller 64 or 66 may be eliminated. Also, impellers could
be used to replace propellers 64 and/or 66 if desired. For some
applications, electrical motor 60 and rotating shaft 62 may not be
required. For these applications, the natural convection of air
over heat sinks 40 and 50 would be used to provide the desired heat
transfer with the surrounding environment. In a natural convection
design, heat sink 50 may be finless and may line part or all of the
enclosure.
Since the present invention results in a compact modular
thermoelectric assembly of heat sinks, insulating material,
thermoelectric device, electrical motor and propellers, the modular
thermoelectric assembly may be installed on the top, bottom, side,
front or any other desired portion of an enclosed structure or
container. The only requirement is that the opening in the
container have a geometric configuration which matches the
configuration of the heat sinks and insulating layer used to
manufacture the specific thermoelectric assembly. Also, the present
invention may be used with other DC, internal or external, power
supplies and is not limited to 12 volt DC power.
FIG. 5 illustrates a perspective view of a second embodiment of a
module 200 and a thermoelectric refrigerator 202 constructed in
accordance with the teachings of the present invention. Although
module 200 is illustrated for use in thermoelectric refrigerator
202, module 200 may be used with any enclosed structure for heating
or cooling without departing from the scope and teachings of the
present invention.
Module 200 includes a thermoelectric assembly 204 similar to that
of modular thermoelectric assembly 130 illustrated in FIG. 4. In
the embodiment illustrated in FIG. 5, thermoelectric assembly 204
comprises heat sink 40, heat sink 50, propeller 64, a second
propeller (not explicitly shown), insulating layer 42, an electric
motor (not explicitly shown), a rotating shaft (not explicitly
shown) and a thermoelectric device (not explicitly shown).
Insulating layer 42 is preferably resilient and can be, for
example, made of rubber or other suitable elastomeric material.
Heat sink 40 in this embodiment has a flange portion (244, shown in
FIG. 7) on either side of heat sink 40 for use in mounting
thermoelectric assembly 204 in module 200.
Thermoelectric assembly 204 mounts in module 200 in the illustrated
embodiment by sliding the flange portions of heat sink 40 onto heat
sink mounting members 208 on platform 212. After thermoelectric
assembly 204 slides into place on heat sink mounting members 208,
it may be affixed to platform 212 using screws, brackets, or any
other type of mounting device. Mounting members 208 could serve as
fasteners for thermoelectric assembly 204 using a locking mechanism
to snap the flanges (244, shown in FIG. 7) of heat sink 40 into
position after they have slid on mounting members 208. Other
fastening mechanisms will be apparent to those skilled in the art
and could be used without departing from the scope and teachings of
the present invention.
Module 200 also includes power supply mounting members 210 for
mounting a power supply (242, shown in FIGS. 6 & 8). The power
supply may also be connected by sliding a flange on the power
supply into power supply mounting members 210 and fixing the power
supply in position with a screw, bracket, or other mounting
device.
Platform 212 is preferably coupled to panel 214. In the embodiment
illustrated in FIG. 5, panel 214 is substantially perpendicular to
platform 212. Rear seal portion 216 of insulating layer 42 couples
to panel 214.
Panel 214 includes a plurality of openings 218 that ventilate air
passing over the surface of heat sink 40. Panel 214 also may
include holes 220 that may be used to mount module 200 to
thermoelectric refrigerator 202. Panel 214 may also include a notch
222 to allow power cord 224 to exit from thermoelectric assembly
204. Power cord 224 couples to the power supply (242, shown in
FIGS. 6 & 8) for thermoelectric assembly 204. In the embodiment
illustrated in FIG. 5, power cord 224 may be run between one or
more fingers of heat sink 40 or along the side of heat sink 40 to
be connected to the power supply (242, shown in FIGS. 6 &
8).
Thermoelectric refrigerator 202 may be box shaped and may include a
module opening 226 for receiving module 200. Vents 228 may also be
formed in enclosed structure or refrigerator 202 to allow
communication of air with module 200. When module 200 is inserted
into opening 226, vents 228 may ventilate heat sink 40 while module
200 operates. Thermoelectric refrigerator 202 also includes molded
grill 230 to allow air contained within refrigerator 202 to
circulate through the refrigerated compartment (not explicitly
shown) of thermoelectric refrigerator 202 and over the surface of
heat sink 50 in response to propeller 66. Molded grill 230 prevents
a user of thermoelectric refrigerator 202 from coming into contact
with propeller 66.
In this way two separate air flow paths may be created. One path
may allow air to circulate over the surface of heat sink 40 via
vents 228 and openings 218. Another path may allow air to circulate
over the surface of heat sink 50 and through the refrigerated
compartment of thermoelectric refrigerator 202.
Thermoelectric refrigerator 202 also may include guide members 232,
insulation 234, ledge 236 and frontal mold 238. Guide members 232
may be slightly angled to aid in compressing insulating layer 42
when module 200 is inserted into thermoelectric refrigerator 202.
Module 200 may be engaged slidingly and removably with
thermoelectric refrigerator 202 by sliding platform 212 into the
slots in guide members 232. When module 200 is inserted into
thermoelectric refrigerator 202, the bottom of insulating layer 42
rests on ledge 236. Insulating layer 42 seals the top portion of
thermoelectric refrigerator 202. Rear seal portion 216 of
insulating layer 42 rests against frontal mold 238 to seal and
insulate the rear of thermoelectric refrigerator 202. Insulation
234 insulates the interior of thermoelectric refrigerator 202.
Mounting bolts 237 may be used to attached module 200 to
thermoelectric refrigerator 202. Mounting bolts 237 pass through
holes 220 and may be inserted in threaded holes 239.
FIG. 6 illustrates a bottom view of module 200, and illustrates
rear seal portion 216 of insulating layer 42. Power supply 242, as
discussed above, slides into power supply mounting members 210.
FIG. 7 illustrates a rear cutaway view of module 200 while inserted
into thermoelectric refrigerator 202. This view illustrates among
other features how openings 218 ventilate heat sink 40. FIG. 7 also
illustrates how platform 212 slides into guide members 232 and how
flange portions 244 of heat sink 40 slide into heat sink mounting
members 208. Gasket 206 sealingly engages against insulation 234,
thus sealing off the upper portion of thermoelectric refrigerator
202 to establish the two separate air flow paths.
FIG. 8 illustrates a side view of thermoelectric refrigerator 202
with module 200 inserted. Thermoelectric refrigerator 202 also
includes door 246 and adjustable shelf 248. FIG. 8 illustrates the
operation of thermoelectric refrigerator 202.
In the embodiment illustrated in FIG. 8, heat sink 40 is ventilated
by vents 228 and openings 218 defining one air flow path. In this
embodiment, intake air is drawn into vents 228 as illustrated by
arrow 250 in response to propeller 64. The air is drawn down over
the surface of heat sink 40 and exits as exhaust air through
openings 218 as illustrated by the direction of arrow 252.
Depending upon the design and direction of rotation of propeller
64, intake air could be drawn through openings 218 and exhaust air
could exit thermoelectric refrigerator 202 through vents 228.
Similarly, in the enclosed structure forming the cooled compartment
254 of thermoelectric refrigerator 202, propeller 66 causes air to
pass over the surface of heat sink 50 and circulate throughout
compartment 254 in the direction shown by arrows 256, forming
another air flow path. Air passes through openings in molded grill
230. Alternatively, depending upon the design and direction of
rotation of propeller 66, air could flow in the opposite direction
in compartment 254.
Power supply 242 can be coupled to an on/off switch and/or a
thermostat (not explicitly shown). The on/off switch may be used to
turn thermoelectric refrigerator 202 on and off while a thermostat
may be used to control the temperature in compartment 254 by
turning thermoelectric device 32 on and off in response to the
thermostat. In the embodiment illustrated in FIG. 8, power supply
242 has an AC to DC convertor and drives thermoelectric device 32
with DC power.
The surface area of vents 228 should be sufficiently large to allow
enough air to pass over heat sink 40 to cool it sufficiently. In
the embodiment illustrated in FIG. 8, vents 228 have a surface area
approximately 75% as large as a circle having approximately the
same circumference as propeller 64. Sufficient open space above
propeller 64 may advantageously be included to allow air to
sufficiently circulate over the surface of heat sink 40, or flow
into propeller 64.
Although the present invention and its advantages have been
described in detail, it should be understood that various changes,
substitutions and alterations can be made without departing from
the spirit and scope of the invention as defined by the following
claims.
* * * * *